[Openstack] Openstack Packstack install - Kilo - Compute node and OVS

BUTTS, Darren (Darren)** CTR ** darren.butts at alcatel-lucent.com
Tue Oct 6 09:18:08 UTC 2015


All

I have installed kilo successfully using packstack to a combination of controller and compute nodes, I am able to successfully create instances however the virtual interfaces are using an MTU of 1500 even though all the bridge interfaces are defined as 9000. I need to ensure that all the virtual interfaces are using an mtu of 9000 but this seems to be getting defined by some other process regardless of how the physical interfaces are configured.

Is there a known limitation or issue with OVS plugins over ML2 or another plugin that causes issues with defining MTU.

You can see below that br-int is set to 1500 ! is this controlling all the other virtual interfaces ? do you have to bind br-int to a real physical interface in order for it to be correctly set ? none of this is done or seen as an option in packstack so it means additional configuration is that really what is needed ?

[root at blade15 ~]# ifconfig | grep mtu
br20: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br100: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br111: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br112: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br201: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br202: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br210: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br220: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br400: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
br-tun: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.20: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.100: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.111: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.112: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.201: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.202: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.210: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.220: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
enp2s0f0.400: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
int-br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 9000
phy-br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
qbr16cfbed6-ba: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbr517cc995-1a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbr7cd380f7-44: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbr8e16ade0-98: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbrbe028441-60: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbre998f0fd-33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qbred796a27-14: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
qvb16cfbed6-ba: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvb517cc995-1a: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvb7cd380f7-44: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvb8e16ade0-98: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvbbe028441-60: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvbe998f0fd-33: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvbed796a27-14: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvo16cfbed6-ba: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvo517cc995-1a: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvo7cd380f7-44: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvo8e16ade0-98: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvobe028441-60: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvoe998f0fd-33: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
qvoed796a27-14: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
tap16cfbed6-ba: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tap517cc995-1a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tap7cd380f7-44: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tap8e16ade0-98: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tapbe028441-60: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
tape998f0fd-33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
taped796a27-14: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

Any help or guidance would be appreciated.

Thanks

Darren
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